Synthesis, spectroscopy, and magnetic characterization of copper(II) and cobalt(II) complexes with 2-amino-5-bromopyridine as ligand |
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Authors: | R. A. Ahmadi F. Hasanvand G. Bruno H. A. Rudbari S. Amani |
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Affiliation: | 1. Chemistry Department, Faculty of Sciences, Arak University, Dr. Beheshti Ave., Arak, 38156-88349, Islamic Republic of Iran 2. Dipartimento di Chimica Inorganica, Universita di Messina, Vill. S. Agata, Salita Sperone 31, Messina, 98166, Italy
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Abstract: | The synthesis, spectroscopic, and magnetic characterization of two new copper(II) and cobalt(II) complexes are described. Both two compounds have the general formula [M(L)2(Cl)2] (M = Cu (I), Co (II); L = 2-amino-5-bromopyridine). These complexes were prepared in one-step synthesis and characterized by elemental analysis, FT-IR, UV-Vis, and EPR spectroscopy. Moreover, the single crystal structure of complex I was studied by the X-ray diffraction method. This compound consists of mononuclear units consisting of two ligands linked to metal via the nitrogen of pyridine ring. The UV-Vis spectra of copper(II) and cobalt(II) complexes show three and five absorption bands, respectively, attributed to the d-d transition of the metal ion, ligand → metal charge transfer and π → π* or n → π* transitions of the ligand. The FT-IR spectra show MN2Cl2 vibrations at 500–300 cm?1. The complexes show room temperature magnetic moments of 1.78 and 4.12 μB for Cu(II) and Co(II), respectively. The X-band electron spin resonance (ESR) spectra of Cu(II) complex in DMF or DMSO frozen at liquid nitrogen temperature show the typical ΔMS = ±1 transition. |
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